Written by Mailivery · Last updated September 26, 2025
Cold email deliverability has gotten tougher. Microsoft and Google are constantly tightening their filters, while spam detection algorithms now look for patterns most senders don’t even realize they’re creating.
One of the easiest ways to avoid landing in spam is by making sure your emails don’t all look the same.
That’s where Spintax comes in.
In this post, we’ll cover:
Spintax (short for spinning syntax) is a simple formatting trick that lets you generate multiple variations of a sentence from one template.
It works by wrapping phrases in curly braces {} and separating alternatives with vertical bars |.
For example:
{Hi|Hey|Hello} {{First_Name}},
Could generate:
Each version is slightly different, but they all sound natural.
Spam filters don’t just look at your sending volume or reputation. They also analyze the content of your emails.
If you send 500 identical messages word-for-word, it raises a red flag. But if you send 500 unique variations, filters are less likely to classify them as bulk spam.
For more strategies on improving deliverability and building sender reputation, check out What Is Email Warm Up: The Missing Step in Your Deliverability Strategy.
Not every part of your email needs spintax. In fact, overusing it can make things look sloppy. The best spots are:
{Hi|Hey|Hello} {{First_Name}},
I saw you’re leading {a growing|an interesting|some cool} project at{{Company}}.
Would you {have time|be free|be open} to {connect for 10 mins|talk next week|catch up soon}?
{Best|Cheers|Talk soon},
[Your Name]
These four areas are enough to make each email look unique without complicating the body too much.
Here’s what a cold email template with spintax might look like:
{Hey|Hi|Hello} {{First_Name}},
I saw you’re leading {an interesting|some cool|a growing} project at {{Company}} and{thought|figured} we might {help|chat|collaborate}.
Would you {have time|be free|be open} to {talk next week|connect for 10 mins|catch up soon}?
{Best|Cheers|Talk soon},
[Your Name]
Both read like a natural, personalized email...not a bulk template.
.png)
While spintax is powerful, most people mess it up. Here are the mistakes to avoid:
Spintax alone won’t save you. Deliverability is a combination of factors:
Spintax plays a role in the content side, while warm-up (what Mailivery specializes in) builds sender reputation. Together, they give you the best chance of reaching the inbox.
Think of it this way: warm-up trains the mailbox providers to trust you, and spintax keeps your templates from tripping filters.
Learn more about what does a warm-up do: Who Needs Email Warmup and Why It's Crucial for Deliverability
If you’re running cold email campaigns, here’s a simple way to implement spintax today:
Spintax isn’t just a gimmick for making emails “different.” Done right, it’s a signal to spam filters that your emails aren’t bulk clones... and to your prospects that you’re not a robot.
It’s one of those small tweaks that, when layered on top of solid deliverability practices, makes a measurable difference.
So next time you’re building a campaign, don’t stop at personalization tokens like {{First_Name}}. Add spintax to make your outreach more human, less predictable, and more likely to land in the inbox.
And if you want the heavy lifting of warm-up, sender reputation, and inbox placement handled automatically — that’s what we built Mailivery for.
Does spintax guarantee I won’t land in spam?
No, but it reduces one of the key signals spam filters use. Pair it with warm-up, domain authentication, and clean lists for best results.
Which cold email tools support spintax?
Platforms like Woodpecker, Automailer.io, MailClickConvert, and Lemlist support spintax. Mailivery’s warm-up system also processes spintax variations so your templates stay effective during warm-up.
Where should I use spintax in my emails?
The best places are greetings, intro sentences, CTAs, and closings. Adding 2–3 spintax blocks per email is enough to make your outreach look unique and natural."
Start Improving your Deliverability with Mailivery Today
The easiest way to get responses to your cold emails.
